<template>
  <a-modal
    v-drag
    :visible.sync="dialogVisible"
    :width="width"
    class="my-dialog"
    cancel-text="取消"
    ok-text="确定"
    @cancel="cancel"
    @ok="ok"
  >
    <a-icon v-if="showClose" slot="closeIcon" type="close" />
    <span v-else slot="closeIcon"></span>
    
    <div slot="title" class="dialog-title">
      <div class="title-box">
        <span>{{title}}</span>
      </div>
    </div>
    <slot />
    <slot slot="footer" name="footer" />
  </a-modal>
</template>
<script>
export default {
  props: {
    dialogVisible: {
      type: Boolean,
      default: false
    },
    title: {
      type: String,
      default: ''
    },
    width: {
      type: String,
      default: ''
    },
    showClose: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      maskId: "mask1",
    }
  },
  methods: {
    cancel() {
      this.$emit('cancel')
    },
    ok() {
      this.$emit('ok')
    }
  },
  //拖拽指令
  directives: {
    drag: {
      bind: function (el, binding, vnode, oldVnode) {
        const dialogHeaderEl = el.querySelector('.ant-modal-header');
        const dragDom = el.querySelector('.ant-modal');
        dialogHeaderEl.style.cssText += ';cursor:move;'
        // dragDom.style.cssText += ';top:50%;transform: translateY(-50%);'
        dragDom.style.cssText += ';top:75px;'
        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
        const sty = (() => {
          if (window.document.currentStyle) {
            return (dom, attr) => dom.currentStyle[attr];
          } else {
            return (dom, attr) => getComputedStyle(dom, false)[attr];
          }
        })()
        dialogHeaderEl.onmousedown = (e) => {
          // 鼠标按下，计算当前元素距离可视区的距离
          const disX = e.clientX - dialogHeaderEl.offsetLeft;
          const disY = e.clientY - dialogHeaderEl.offsetTop;
          const screenWidth = document.body.clientWidth; // body当前宽度
          const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
          const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
          const dragDomheight = dragDom.offsetHeight; // 对话框高度
          const minDragDomLeft = dragDom.offsetLeft;
          const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
          const minDragDomTop = dragDom.offsetTop;
          const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
          // 获取到的值带px 正则匹配替换
          let styL = sty(dragDom, 'left')
          let styT = sty(dragDom, 'top')
          // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
          if (styL.includes('%')) {
            styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100)
            styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100)
          } else {
            styL = +styL.replace(/\px/g, '')
            styT = +styT.replace(/\px/g, '')
          }
          document.onmousemove = function (x) {
            // 通过事件委托，计算移动的距离
            let left = x.clientX - disX;
            let top = x.clientY - disY;
            // 边界处理
            if (-(left) > minDragDomLeft) {
              left = -(minDragDomLeft);
            } else if (left > maxDragDomLeft) {
              left = maxDragDomLeft;
            }
            if (-(top) > minDragDomTop) {
              top = -(minDragDomTop);
            } else if (top > maxDragDomTop) {
              top = maxDragDomTop;
            }
            // 移动当前元素
            dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
          }
          document.onmouseup = function (y) {
            document.onmousemove = null;
            document.onmouseup = null;
          }
        }
      },
    },
  },
}
</script>
<style lang="less" scoped>
  .my-dialog{
    /deep/ .ant-modal{
      .ant-modal-header{
        padding: 13px 21px;
        .title-box{
          font-size: 16px;
          color: #333;
          line-height: 24px;
        }
      }
    }
  }
</style>